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		The package <tt>xxl.core.collections.queues.io</tt> provides some
		implementations of the queue datastructure using special containers 
		({@link xxl.core.collections.queues.io.BlockBasedQueue}),
		files ({@link xxl.core.collections.queues.io.FileStackQueue}) 
		or streams ({@link xxl.core.collections.queues.io.StreamQueue}) 
		for storing and receiving the data.
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